First cut at adding arm64 Linux / Android support to Breakpad.

This is an initial attempt to add Arm64 (aarch64) support to Breakpad for
Linux / Android platforms.  This CL adds the Arm64 data structures, but does
not yet implement the Android getcontext support or CPUFillFromThreadInfo /
CPUFillFromUContext.

BUG=354405,335641
R=mark@chromium.org

Review URL: https://breakpad.appspot.com/1354002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1301 4c0a9323-5329-0410-9bdc-e9ce6186880e

2 files changed, 11 insertions, 8 deletions

diff --git a/src/client/linux/handler/exception_handler.cc b/src/client/linux/handler/exception_handler.cc
index 58fbacbd..9d081ca8 100644
--- a/src/client/linux/handler/exception_handler.cc
+++ b/src/client/linux/handler/exception_handler.cc
@@ -398,8 +398,8 @@ bool ExceptionHandler::HandleSignal(int sig, siginfo_t* info, void* uc) {
   CrashContext context;
   memcpy(&context.siginfo, info, sizeof(siginfo_t));
   memcpy(&context.context, uc, sizeof(struct ucontext));
-#if !defined(__ARM_EABI__) && !defined(__mips__)
-  // FP state is not part of user ABI on ARM Linux.
+#if !defined(__ARM_EABI__) && !defined(__aarch64__) && !defined(__mips__)
+  // FP state is not part of user ABI on ARM or ARM64 Linux.
   // In case of MIPS Linux FP state is already part of struct ucontext
   // and 'float_state' is not a member of CrashContext.
   struct ucontext *uc_ptr = (struct ucontext*)uc;
@@ -608,7 +608,7 @@ bool ExceptionHandler::WriteMinidump() {
   }
 #endif
 
-#if !defined(__ARM_EABI__) && !defined(__mips__)
+#if !defined(__ARM_EABI__) && !defined(__aarch64__) && !defined(__mips__)
   // FPU state is not part of ARM EABI ucontext_t.
   memcpy(&context.float_state, context.context.uc_mcontext.fpregs,
          sizeof(context.float_state));
@@ -627,6 +627,9 @@ bool ExceptionHandler::WriteMinidump() {
 #elif defined(__arm__)
   context.siginfo.si_addr =
       reinterpret_cast<void*>(context.context.uc_mcontext.arm_pc);
+#elif defined(__aarch64__)
+  context.siginfo.si_addr =
+      reinterpret_cast<void*>(context.context.uc_mcontext.pc);
 #elif defined(__mips__)
   context.siginfo.si_addr =
       reinterpret_cast<void*>(context.context.uc_mcontext.pc);
diff --git a/src/client/linux/handler/exception_handler.h b/src/client/linux/handler/exception_handler.h
index b57f58d4..2e842d83 100644
--- a/src/client/linux/handler/exception_handler.h
+++ b/src/client/linux/handler/exception_handler.h
@@ -190,10 +190,10 @@ class ExceptionHandler {
     siginfo_t siginfo;
     pid_t tid;  // the crashing thread.
     struct ucontext context;
-#if !defined(__ARM_EABI__) && !defined(__mips__)
-    // #ifdef this out because FP state is not part of user ABI for Linux ARM.
-    // In case of MIPS Linux FP state is already part of struct ucontext
-    // so 'float_state' is not required.
+#if !defined(__ARM_EABI__) && !defined(__aarch64__) && !defined(__mips__)
+    // #ifdef this out because FP state is not part of user ABI for Linux ARM
+    // or ARM64. In case of MIPS Linux FP state is already part of struct
+    // ucontext so 'float_state' is not required.
     struct _libc_fpstate float_state;
 #endif
   };
@@ -259,7 +259,7 @@ class ExceptionHandler {
   // We need to explicitly enable ptrace of parent processes on some
   // kernels, but we need to know the PID of the cloned process before we
   // can do this. We create a pipe which we can use to block the
-  // cloned process after creating it, until we have explicitly enabled 
+  // cloned process after creating it, until we have explicitly enabled
   // ptrace. This is used to store the file descriptors for the pipe
   int fdes[2];